Laser Ablated Antenna Structures for Dual Interface Smartcards
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Solution Overview
Problem
Current RFID devices, particularly smartcards operating in contactless mode, face challenges in achieving optimal communication performance due to limitations in antenna design and material thickness, which affect the separation distance and efficiency of data exchange with external readers.
Innovation Solution
The use of laser etching and chemical etching techniques to form antenna structures with reduced material thickness, allowing for multiple antenna structures within a compact module, and incorporating LEDs for visual indication in contactless transactions, enhances communication performance by optimizing the antenna's capacitive and inductive coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional chemical etching is used to form antenna structures, then the antenna can be manufactured with standard processes, but the material thickness cannot be sufficiently reduced and the separation distance between antenna tracks is limited
Solution Approach 1:
The patent replaces traditional chemical etching processes with laser-based ablation and melting techniques. The laser system uses focused optical energy to precisely remove or reshape conductive material, enabling control of track separation distances that are too small for chemical etching processes to achieve. This substitution of chemical-mechanical processes with optical-energy-based processing resolves the contradiction by allowing manufacturing precision at scales below the limitations of chemical etching.
Solution Approach 2:
The patent changes the fundamental processing parameters from chemical etching conditions (etchant concentration, temperature, time) to laser processing parameters (power, pulse duration, scanning speed, wavelength). By adjusting these laser parameters, the system can precisely control the depth of material removal and the heat-affected zone, thereby achieving minimal track separation distances while maintaining manufacturing precision. The ability to dynamically adjust laser parameters allows optimization of both precision and minimal separation.
2Productivity
If multiple antenna structures are placed in a compact module to improve communication performance, then the antenna density increases, but the manufacturing complexity and precision requirements increase
Solution Approach 1:
The patent segments the antenna module into multiple independent antenna structures that can be individually processed by the laser system. Each antenna track is created as a separate feature through controlled laser ablation or melting, allowing precise positioning and spacing. The laser system can selectively process different regions of the substrate, creating multiple antenna elements with consistent precision across the entire module, thereby enabling high antenna density without compromising manufacturing precision.
Solution Approach 2:
The laser-based processing system replaces traditional mechanical and chemical fabrication methods, providing the precision needed for multiple compact antenna structures. The focused laser beam can create features with sub-millimeter precision, and the digital control of laser positioning allows consistent reproduction of antenna geometries across multiple structures in a single module, resolving the precision challenge of high-density antenna arrays.
3Reliability
If the conductive layer thickness is reduced to enhance electromagnetic properties, then the antenna efficiency improves, but the structural integrity and current carrying capacity may be compromised
Solution Approach 1:
The patent changes the conductive layer thickness parameter to optimized values that balance electromagnetic performance and mechanical strength. By using laser processing, the system can create precisely controlled thin conductive layers with consistent thickness throughout, eliminating variations that would compromise reliability. The laser can also create surface features or patterns within the thin layer that enhance current distribution, maintaining electrical performance while using minimal material thickness for optimal electromagnetic properties.
Solution Approach 2:
The patent employs composite material structures where thin conductive layers are combined with supporting substrates or additional functional layers. The laser processing can create integrated multi-layer structures where the conductive trace is bonded to or embedded within a mechanically robust substrate, providing both the thin profile needed for electromagnetic efficiency and the structural support needed for mechanical integrity and current carrying capacity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach improves the communication range and reliability of RFID devices by increasing the number of turns and reducing the thickness of conductive layers, thereby enhancing the electromagnetic properties of the antenna, and allows for the elimination of booster antennas in some cases.
Implementation Method 1
The use of laser etching and chemical etching techniques to form antenna structures with reduced material thickness
Implementation Method 2
optimizing the antenna's capacitive and inductive coupling
Implementation Method 3
optimizing the antenna's capacitive and inductive coupling
Data Source
AI summary
Laser etching antenna structures (AS) for RFID antenna modules (AM). Combining laser etching and chemical etching. Limiting the thickness of the contact pads (CP) to less than the skin depth (18 m) of the conductive material (copper) used for the contact pads (CP). Multiple antenna structures (AS1, AS2) in an antenna module (AM). Incorporating LEDs into the antenna module (AM) or smartcard (SC).